著者

菖蒲 信一郎 山口 純一郎 松崎 正文 田中 茂雄

出版者

九州病害虫研究会

雑誌

九州病害虫研究会報 (ISSN:03856410)

巻号頁・発行日

vol.38, pp.55-56, 1992-10-30 (Released:2009-05-22)

参考文献数

1

著者

菖蒲 信一郎 御厨 初子 山口 純一郎 松崎 正文 松村 正哉

出版者

日本応用動物昆虫学会

雑誌

日本応用動物昆虫学会誌 (ISSN:00214914)

巻号頁・発行日

vol.46, no.3, pp.135-143, 2002 (Released:2003-04-25)

参考文献数

29

被引用文献数

14 18

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Fluctuations in the wing-form ratio of the brown planthopper (BPH), Nilaparvata lugens, were examined by collecting fifth-instar nymphs from rice fields. Two peaks of brachypterous females were observed at 40–50 days after transplanting (DAT) and 75–85 DAT (5 days before heading–10 days after heading). After 75–85 DAT, the percentage of brachypterous females decreased with an increase in BPH density. However, the BPH density was still low after 40–50 DAT when the first decrease in the percentage of brachypterous females occurred. Thus, not only population density of BPH, but also the rice plant stage seems to affect the fluctuations in female wing-form ratio. The SPAD readings of rice leaf, which are associated with leaf nitrogen content, fluctuated with rice plant stage and showed two peaks at 30–50 DAT and 65–80 DAT. The fluctuation pattern of the SPAD readings was similar to that of the percentage of brachypterous females. This suggests that the percentage of brachypterous females fluctuated in accordance with a decrease in nitrogen content of rice plants.

著者

松山賢 池田 憲一 山口 純一 栗岡 均 大宮 喜文 若松 孝旺

出版者

一般社団法人日本建築学会

雑誌

日本建築学会大会学術講演梗概集 (北陸), 2002-8 (ISSN:13414445)

巻号頁・発行日

pp.133-134, 2002

被引用文献数

1